The branch main has been updated by cperciva:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=e094f9015be16d07fe1c78c6eeaad73d1f8705ec

commit e094f9015be16d07fe1c78c6eeaad73d1f8705ec
Author:     Colin Percival <cperc...@freebsd.org>
AuthorDate: 2025-06-19 18:15:10 +0000
Commit:     Colin Percival <cperc...@freebsd.org>
CommitDate: 2025-06-19 18:15:10 +0000

    release/GCE: Remember whether we mounted /dev
    
    Don't unmount /dev inside the image if we didn't mount it.  We might
    end up unmounting a /dev which is still needed.
    
    Fixes:  611c1457ff32 ("release: Add set -e to abort upon failure")
---
 release/tools/gce.conf | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/release/tools/gce.conf b/release/tools/gce.conf
index fc72b381a02d..382a839786f3 100644
--- a/release/tools/gce.conf
+++ b/release/tools/gce.conf
@@ -24,6 +24,8 @@ vm_extra_install_base() {
 }
 
 vm_extra_pre_umount() {
+       local DEVFSISOURS
+
        # Enable growfs on every boot, not only the first, as as instance's 
disk can
        # be enlarged post-creation
        sed -i -e '/KEYWORD: firstboot/d' /etc/rc.d/growfs
@@ -93,6 +95,7 @@ EOF
        # and fetch the sources for the third-party software installed on
        # the image.
        if [ ! -c "${DESTDIR}/dev/null" ]; then
+               DEVFSISOURS=1
                mkdir -p ${DESTDIR}/dev
                mount -t devfs devfs ${DESTDIR}/dev
        fi
@@ -107,7 +110,7 @@ EOF
                                make -C /usr/ports/${PACKAGE} fetch
                done
        fi
-       if [ -c "${DESTDIR}/dev/null" ]; then
+       if [ "$DEVFSISOURS" = "1" ]; then
                umount_loop ${DESTDIR}/dev
        fi
 

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